linux-kernel - Re: [PATCH] mm/zbud: init user ops only when it is needed

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Message-Id: <20141015131710.ffd6c40996cd1ce6c16dbae8@linux-foundation.org>
Date:	Wed, 15 Oct 2014 13:17:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Heesub Shin <heesub.shin@...sung.com>
Cc:	Dan Streetman <ddstreet@...e.org>,
	Seth Jennings <sjennings@...iantweb.net>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Sunae Seo <sunae.seo@...sung.com>
Subject: Re: [PATCH] mm/zbud: init user ops only when it is needed

On Wed, 15 Oct 2014 19:00:43 +0900 Heesub Shin <heesub.shin@...sung.com> wrote:

> When zbud is initialized through the zpool wrapper, pool->ops which
> points to user-defined operations is always set regardless of whether it
> is specified from the upper layer. This causes zbud_reclaim_page() to
> iterate its loop for evicting pool pages out without any gain.
> 
> This patch sets the user-defined ops only when it is needed, so that
> zbud_reclaim_page() can bail out the reclamation loop earlier if there
> is no user-defined operations specified.

Which callsite is calling zbud_zpool_create(..., NULL)?

> ...
> --- a/mm/zbud.c
> +++ b/mm/zbud.c
> @@ -132,7 +132,7 @@ static struct zbud_ops zbud_zpool_ops = {
>  
>  static void *zbud_zpool_create(gfp_t gfp, struct zpool_ops *zpool_ops)
>  {
> -	return zbud_create_pool(gfp, &zbud_zpool_ops);
> +	return zbud_create_pool(gfp, zpool_ops ? &zbud_zpool_ops : NULL);
>  }
>  
>  static void zbud_zpool_destroy(void *pool)

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